I am so sorry for your loss.
I've been there, and I think it's quite normal. It's almost as though you're in shock right now. My dad has been gone for 25 years, and after my mom passed away, there was so much to deal with -- arrangements to be made, settling my parents' estate, dealing with the house and all the belongings, etc. I experienced that kind of numb feeling too, which I think is the result of feeling overwhelmed with the enormity of the loss. There is something very profound about losing the last parent. Maybe, it's because as my sister so bluntly put it, "we're next." I didn't think of it quite so morbidly, but she is 10 years older than I am. (And yes, we have a rather dark sense of humor in my family.)
I found some of the most difficult days emotionally came after that feeling of numbness. It was as though the ability to feel the grief was returning. I'd be going on about my day and something would make me think of mom, and I'd be a mess. Tears in the grocery store, having to pull over my car and cry because I had a brief moment when I went to call her, etc.
I hope you move through the grieving process with support and love -- both from yourself and your family and friends. There is no one way to grieve, and there is no timetable. I am sending hugs and good wishes!
ETA: I really have to give you such huge credit for being able to do the eulogy. I could not even bring myself to consider speaking in front of people for either of my parents' memorials. And I just watched my best friend since high school perform the eulogy for his wife, in front of his four children, which I know was one of the most difficult things he's ever done. In some ways I feel guilty for not believing I was able to do that. So, I say well done for choosing to honor your mother so bravely.